Pyramid Geophysical Services was contracted to assist in a comprehensive evaluation of subsurface geologic and hydrogeologic conditions along a causeway in South Carolina. The causeway was experiencing slope failures and ground collapses. These failures were thought to be the result of both the presence of buried … [Read more...]
Geophysical Ground Conductivity Mapping
The use of electromagnetic (EM) geophysical methods to evaluate ground conductivity variations is an effective tool to resolve environmental issues. However, the EM profiling instruments commonly used (such as the Geonics EM31 ground conductivity meter) for such applications provide depth-averaged conductivity values … [Read more...]
Carlsbad Caverns – Resistivity Mapping for Caves
Pyramid Geophysical Services performed a geophysical investigation for the National Park Service at Carlsbad Caverns National Park in Carlsbad, NM. The survey used electrical resistivity mapping (ER) to look for potential underground caves or caverns near an area designated for the construction of an underground … [Read more...]
3D Modeling of Electrical Resistivity Data
Electrical resistivity (ER) testing is an effective geophysical method to identify subsurface geologic hazards, stratigraphic variability, karst features, and hydrogeologic conditions. A typical single ER test utilizes an array of electrodes placed in a straight line at a consistent spacing across a target area. This … [Read more...]
Electrical Resistivity Mapping Across a Stream Channel
Electrical Resistivity Tomography (ERT) is an effective method for engineering projects in atypical environments that require a detailed understanding of geologic conditions, stratigraphy and/or hazards. ERT is unique among geophysical methods because a single test can be performed crossing both land and … [Read more...]
